啶虫脒在芹菜设施栽培体系下的沉积与残留

通过田间试验,研究了芹菜设施栽培条件下啶虫脒的沉积与残留规律,并建立了芹菜叶、茎、根,以及土壤中的啶虫咪经乙腈提取、QuEChERs萃取净化和液相色谱串联质谱检测的方法。结果表明:啶虫脒在芹菜叶、茎、根和土壤中的平均回收率分别为100.2%~102.5%、83.9%~93.5%、97.0%~100.1%和90.8%~94.4%,在芹菜设施栽培体系中啶虫脒的沉积量由大到小依次为芹菜叶>土壤>芹菜茎>芹菜根。啶虫脒在芹菜叶的残留消解动态符合一级动力学方程,消解半衰期为4.2~19.4 d。按有效成分18 g·hm^-2和27 g·hm^-2施药后7 d,设施栽培条件下芹菜叶和茎的啶虫咪残留量分别为0.330 0~2.570 0、0.004 7~0.030 0 mg·kg^-1,均低于GB 2763—2019规定的最大残留限量(3 mg·kg^-1)。研究结果可为啶虫脒在芹菜设施栽培体系下的合理使用提供科学参考。

Deposition and residue of acetamiprid under protected celery cultivation

Based on the field experiments and laboratory tests, the deposition and residue characteristics of acetamiprid in celery under protected cultivation were studied, and a detection method was also established. The acetamiprid in soil and plant samples was extracted by using acetonitrile, purified by QuEChERs and detected by liquid chromagraphy-mass spectrometry. The average recoveries of acetamiprid in celery leaf, stem, root and soil were 100.2%-102.5%, 83.9%-93.5%, 97.0%-100.1% and 90.8%-94.4%, respectively. The amount of acetamiprid deposition decreased as celery leaf>soil>celery stem>celery root. The degradation curve of acetamiprid in celery leaf was in accordance with the first-order kinetic equation, and the degradation half-life of acetamiprid was 4.2-19.4 d. Seven days after application of acetamiprid with dosage of 18, 27 g·hm^-2, the residues of acetamiprid in celery leaf and stem were 0.330 0-2.570 0, 0.004 7-0.030 0 mg·kg^-1, respectively, which were below the maximum residue limit (3 mg·kg^-1) of the Chinese national standard GB 2763—2019. The results could provide scientific reference for the rational use of acetamiprid on celery under protected cultivation.